Reviews by patients who have Tooth Pain and take Zinc either as part of daily diet or as method of treatment. Positive and negative experiences from patients with Tooth Pain that take Zinc
1 Red or black colored stool may be a sign of bleeding in the GI tract (from the esophagus, stomach, small intestine or colon) and should not be ignored.  When stool color changes, what tests need to be done depend upon depends upon what cause is suspected for the stool color change.
What To Do If Your Stool Is Black. If you have black stools that you can not attribute to a food or to iron supplements, see your doctor as soon as possible. A black stool once in a while that always occurs after eating foods that are dark in color is typically nothing to worry about.